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United States Patent | 6,017,064 |
Harrington | January 25, 2000 |
In a piping system having a main pipe or fitting joined to a lateral pipe, a restraint body or sling extends about the fitting or main pipe and is secured at opposite ends to the lateral pipe. The lateral pipe, main pipe or fitting and restraint body are formed of plastic material. The restraint body includes a bend intermediate its ends for wrapping about the fitting or main pipe and has arcuate sections at its ends for solvent-welding to the lateral pipe. Any tendency toward separation of the lateral pipe and the main fitting or main pipe is resisted in tension by the restraint body and the joint is stress-relieved.
Inventors: | Harrington; Donald W. (1513 Old Abert Rd., Lynchburg, VA 24503) |
Appl. No.: | 073823 |
Filed: | May 7, 1998 |
Current U.S. Class: | 285/21.3; 285/114; 285/133.21; 285/133.3; 285/197; 285/423 |
Intern'l Class: | F16L 013/02 3 |
Field of Search: | 285/114,197,198,199,135.2,133.3,133.4,133.5,133.6,133.11,133.21,21.3,FOR 138,42 |
389180 | Sep., 1888 | Wiggins | 285/136. |
2387154 | Oct., 1945 | Kalwitz | 285/133. |
3649055 | Mar., 1972 | Nilsen | 285/21. |
4135258 | Jan., 1979 | Braga et al. | |
4761024 | Aug., 1988 | Ewen. | |
5199749 | Apr., 1993 | Corcoran. | |
5257739 | Nov., 1993 | Pascaru. | |
Foreign Patent Documents | |||
970792 | Jul., 1975 | CA. | |
0 552 710 | Jul., 1993 | EP. | |
2038795 | Feb., 1990 | JP | 285/FOR. |
4025694 | Jan., 1992 | JP | 285/FOR. |
159899 | Oct., 1972 | NL | 285/FOR. |
1620-765 | Jan., 1991 | SU. | |
1139773 | Jan., 1969 | GB | 285/FOR. |
"Introducing Harco Push-On Joint Ductile Iron Fittings" brochure, The Harrington Corp. |